Thermostat



E. J. ROHNE.

THERMOSTAT.

APPLlCATION FILED FEB. 28. ms.

1,323,203. 7 Patented Nov. 25, 1919.

InvenTor EyenJRohne y a Cli-f'orney UNITED STATES PATENT OFFICE.

EVEN J. ROI-INE, 0F MINNEAPOLIS, MINNESOTA.

THERMOST'AT.

Application filed February 28, 1918.

To all whom, it may concern:

Be it known that I, Evnx J. ROHNE, a citi; zen of the United States, and a resident of l\linneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Thermostats, of which. the followingis a specification.

One object of my invention is to provide, in a simple, inexpensive type of thermostat, an element so mounted that it will not read ily lose its adjustment.

Another object of my invention is to provide, in a thermostat, simplified means for protecting the thermostatic element.

Another object of my invention is to provide, in a thermostat, a simplified means of adjustment.

With these and incidental objects in view the invention consists of certain novel features of construction and combination of parts, the essential elements of which are hereinafter described with reference to the drawing which accompanies and forms a part of this specification.

In the drawing Figure 1 is a plan view of my improved thermostat with a portion of the adjusting dial broken away, and Fig. 2 is a side elevation of the same.

As shown in the drawing, the mounting plate 1 has extending therefrom, and formed back over the top thereof, a tongue 2.

Ears 3 and 4, formed from the base plate 1, clamp the tongue 2 between the locating ears 5 and 6 and hold in place the thermostat element 7 composed of dissimilar metals clamped between the two pieces of the insulation 8 and 9.

In assembling the insulation and thermostatic element, I prefer to exert suflicient pressure on the top of the tongue 2 so as to embed the thermostatic element in the insulation, thereby obviating any possibility of side motion of the thermostatic element.

The wire 10, either soldered to, or connected by pressure only, with the element 7, is brought out for forming one side of the circuit, the base plate forming the other side, and with the ears 5 and 4 forced strongly down, the thermostat is so solidly held that the set of the baseplate and the element is permanent.

Looking at Fig. 2, it will be seen that the tongue 2 is carried forwardly beyond the ears 5 and 6, forming an adjustment means 11.

The end 12 of the base plate is formed Specification of Letters Patent.

Patented Nov. 25, 1919.

Serial No. 219,718,

upwardly to serve as a stop for the extension 11, and the dial 13, carrying a screw 14 threaded in the extension 11 and rotatably carried at 15 in the base plate, provides means for adjusting the extension 11 with respect to the base plate.

A contact point 16, carried by the extension 11, and a contact anvil 17 carried by the thermostat element 7, is hence adjustable by means of the dial 133, and the temperature at which the contact between the point 16 and the anvil 17 will open or close will be determined by the position of the dial 13.

A rib 18, formed in the base plate from the point 19 and around on the tongue 2 to the point 20, stiffens the structure, and apertures 21 are provided for mounting the base plate to an electric pad or any other device with which it is to be employed.

The foregoing description, together with the drawing, will readily show that while the structure I have provided is exceedingly simple and inexpensive to manufacture, it is, at the same time, rigid and permanent with regard to the fixing of the thermostat element, while, at the same time, the point at which the thermostat contact will open or close may be adjusted by simplified means.

In order to reduce the wear on the extension 11 and dial 13, I prefer to carry on the screw 14 a brass washer 22, although, of course, this is not absolutely necessary.

Particular attention is called to the manner in which the thermostatic element is covered or guarded between the base and the extension 11, so that it is practically impossible for the element to be struck by any outside object and so damaged.

While I have described my invention and illustrated it in one particular design, I do not wish it understood that I limit myself to this construction, as it is evident that the application of my invention may be varied in many ways within the scope of the following claims.

Claims:

1. In a thermostat the combination, with a thermostatic element and insulation therefor, of a base plate having a tongue extending therefrom and covering said element, and insulation, ears formed from said base plate and clamping said tongue, said insulation and said element together, and an extension of said tongue beyond said clamping point carrying a contact co-acting with a contact carried by said thermostatic element.

2. In a thermostat the combination, with a thermostatic element and insulation therefor, of a base plate having a tongue extending therefrom and covering said element and insulation, ears formed from said base plate and clamping said tongue, said insulation and said element together, an extension of said tongue beyond said clamping point carrying a contact co-actin'g with a contact carried by said thermostatic element, and positioning ears upon said tongue and extending on each side of said clamping ears.

3. In a thermostat the combination, with a thermostatic element and insulation. therefor, of a base plate, a clamping tongue extending from said base plate, means for clamping said element and insulation between said tongue and base plate, an extension from said clamping tongue carrying thereon a contact co-acting with a contact carried by said element, and adjustment means for varying the position of said extension with respect to said base plate.

4. In a thermostat the combination, with a thermostatic element and insulation therefor, of a base plate having a tongue extending therefrom, means formed around and clamping said element, insulation and tongue, an extension from said tongue carrying a contact co-acting with a contact carried by said element, a lip formed upwardly from said base plate and serving as a stop for said extension, and adjustable means for varying the position of said extension with respect to said lip.

5. In a thermostat the combination, with a thermostatic element carrying a contact point on one end thereof, insulation for said element, a base plate having a tongue extending therefrom and formed around and clamping to said base plate, said element and insulation, clamping ears formed upwardly from said base plate and looking over said clamping tongue, an extension of said tongue carrying a contact point to 00- act with said contact carried by said element, an upwardly formed lip on said base plate to limit the downward motion of said extension, a dial having a screw extending therefrom engaging by screw connection with said extension and journaled in' said base to provide screw adjustment means between said extension and said lip.

EVEN J. ROHNE. 

